Elevated temperature dry sliding wear behavior of nickel-based composite coating on austenitic stainless steel deposited by a novel central hollow laser cladding |
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Authors: | Xiang-Ming HeXiu-Bo Liu Ming-Di WangMao-Sheng Yang Shi-Hong ShiGe-Yan Fu Shu-Fa Chen |
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Affiliation: | a School of Mechanical & Electric Engineering, 178 Ganjiang East Road, Soochow University, Suzhou 215021, PR China b College of Mechanical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, PR China |
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Abstract: | In order to improve the high-temperature wear resistance of austenitic stainless steel, a wear resistant composite coating reinforced with hard (Cr,Fe)7C3 carbide and toughened by ductile γ-(Ni,Fe)/(Cr,Fe)7C3 eutectic matrix was fabricated by a novel central hollow laser cladding technique. The constituent phases and microstructure as well as high-temperature tribological behaviors of the Ni-based coating were investigated, respectively, and the corresponding wear mechanisms were discussed. It has been found that the composite coating exhibits superior wear resistance than substrate either at ambient or high temperatures. The coating shows better sliding wear resistance at 600 °C than 300 °C owing to high-temperature stability of the reinforced carbide and polishing effect as well as formation of continuous lubricious films, which implied it has large potential industrial applications at relatively higher temperatures. |
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Keywords: | Austenitic stainless steel Central hollow laser cladding Ni-based composite coating High-temperature wear resistance |
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